Thread: Clearing stdin

HI there,

Currently I am running a loop where fgets is used to read the first 80 characters into a string. This function is being called within a while loop that currently continues until all stdin is read ie if 160 characters are input it will repeat twice (thus printing the two strings), How would I go about clearing the stdin value once the first 80 characters are read? ie that the function will only print one of the strings. It is important to note that the condition of the while loop cannot be changed as it functions as the quit command (when the string returned =="quit" the lop exits).

Thank-you for your time
~qwertyuiop23

EDIT:: Here is a short example of what I am meaning:

Code:

#include <stdio.h>
#include <string.h>

int getstring()
{
	char buffer[10];
	char *cp = fgets(buffer,10,stdin);
	int quit = 0;
	if (cp!=NULL) {
		if (strncmp(buffer,"quit",4)==0) {
			quit = 1;
		} else {
			quit = 0;
		}
	}
	return quit;
}

int main()
{
	do {
		printf("\nStill running:");
	} while (getstring()!=1);
	return 0;
}

Read this: FAQ: Clearing the input buffer. It gives you a couple of options with explanations.

> strlen worked a treat. I just put this code in:
Except if the user typed in "12345678\n", the buffer would be exactly full and there would be NO extra characters on the input stream.

Check to see if your buffer has a \n before deciding to get rid of remaining characters.